Convert MP4 to MP3

MP4 → MP3. Source file ≤ 2 GB · Output ≤ 100 MB · audio stream #1 → audio · video → ∅.

MP4 is a video container, not a codec. Its actual video and audio codecs depend on the file. MP3 is lossy audio; a higher bitrate usually produces a larger file. Only the first audio track is extracted; the source must contain audio. Video input is limited to 2 GB; audio output to 100 MB.

MP4 → MP3: Example settings

60 s × 192 kbps ÷ 8 ≈ 1.44 MB • MP3

MP3: Output

Sizes are examples, not guarantees. Container overhead is extra; variable bitrate and image content change the result. Keep the original and compare the output.

Choose MP3 for listening, not for keeping a video

Upload an MP4 that contains sound, choose MP3 and keep the original MP4. This tool encodes the first audio track and leaves out the picture. A silent video cannot produce an audio extract. If your file has several languages or commentary tracks, check which track is first before converting; this page does not offer a track selector.

Does 320 kbps improve an AAC recording?

No bitrate setting restores detail already lost in the recording. AAC to MP3 is another lossy encode. Start with 192 kbps for a listening copy and compare a short section containing speech and music. Use WAV when another editor needs PCM audio, but expect a larger file without recovered detail. Keep the source for future edits.

Check the downloaded audio

Play the beginning and end, check that the expected voice or language is present, and compare duration with the source. MP3 encoder delay and padding can make the measured duration slightly different. A 60-second, 192 kbps stream is about 1.44 MB before headers; this is a calculation, not a measured output or size promise.

A checked example, not a size promise

In our local check, a generated 1-second 160 × 90 MP4 with a 440 Hz tone was 26,896 bytes. The MP3 result was 25,491 bytes, contained only audio and decoded successfully with a measured duration of 1 second. The matching silent-video check was rejected. Real recordings, metadata and encoder versions can produce different sizes.

JavaScript is required for file selection and processing.